• About
  • Policies
  • What is open access
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Physics
      • Dept. of Physics - Ph.D. / Sc.D.
      • View Item
      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Physics
      • Dept. of Physics - Ph.D. / Sc.D.
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Characterization and applications of negative-index metamaterials

      Thumbnail
      View / Download
      6.1 Mb
      Author
      Aydın, Koray
      Advisor
      Özbay, Ekmel
      Date
      2008
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
      Item Usage Stats
      168
      views
      51
      downloads
      Abstract
      Metamaterials offer novel electromagnetic properties and promising applications including negative refraction, flat-lenses, superlenses, cloaking devices. In this thesis, we characterized the negative-index metamaterials that is composed of periodic arrangements of split-ring resonators (providing negative permeability) and thin wire (providing negative permittivity) arrays. The resonances of split-ring resonators (SRR) are investigated experimentally and theoretically. By combining SRR and wire arrays together, we observed a transmission band where both permittivity and permeability are simultaneously negative, indicating a left-handed behavior. Reflection measurements reveal that the impedance is matched to the free space at a certain frequency range. The lefthanded metamaterial is also shown to exhibit negative refractive index by using three different experimental methods namely, refraction from a wedge-shaped negative-index metamaterial (NIM), beam-shift from a slab-shaped NIM and phase shift from NIMs with different lengths. Flat-lens behavior is observed from a slabshaped negative-index metamaterial based microwave lenses. Furthermore, we demonstrated subwavelength imaging and subwavelength resolution by using thin superlenses constructed from SRR-wire arrays with an effective negative index. We have been able to image a point source with a record-level, λ/8 resolution. SRRand wire arrays exhibit negative index provided that the wave propagates parallel to the plane of SRR structure which makes it hard to fabricate at higher frequencies. An alternative structure called fishnet metamaterial however could yield negative index with wave propagation normal to the structure. We observed left-handed transmission and negative phase velocity in fishnet type metamaterials. Finally, we studied enhanced transmission from a single subwavelength aperture by coupling incident electromagnetic wave to a single SRR placed at the near-field of the aperture.
      Keywords
      Metamaterial
      Enhanced Transmission
      Subwavelength Resolution
      Subwavelength Imaging
      Superlens
      Flat-lens
      Negative-Phase Velocity
      Negative Refraction
      Negative Permeability
      Negative Permittivity
      Split Ring Resonator
      Left-Handed Material
      Permalink
      http://hdl.handle.net/11693/14717
      Collections
      • Dept. of Physics - Ph.D. / Sc.D. 73
      Show full item record

      Related items

      Showing items related by title, author, creator and subject.

      • Thumbnail

        Negative refraction using true left-handed metamaterials 

        Aydın, Koray (Bilkent University, 2004)
        Left-handed materials and negative refraction attracted a great amount of attention in recent years due to their unique physical properties. It is possible to obtain a left-handed material by combining a novel artificial ...
      • Thumbnail

        The magical world of metamaterials 

        Özbay, Ekmel (IEEE, 2009-10)
        In recent years, there has been a burgeoning interest in rapidly growing field of metamaterials due to their unprecedented properties unattainable from ordinary materials. Veselago pointed out that a material exhibiting ...
      • Thumbnail

        Development of left-handed composite materials and negative refracting photonic crystals with subwavelength focusing 

        Özbay, Ekmel (SPIE, 2005)
        We review the studies conducted in our group concerning electromagnetic properties of metamaterials and photonic crystals with negative effective index of refraction. In particular, we demonstate the true left handed ...

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy